Scenario 1
Average adult
70kg, 175cm → BMI = 70 ÷ 1.75² = 22.9 — Normal weight.
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BMI Calculator
Calculate your BMI in seconds — and understand what it means.
Adjust your inputs
Results update instantly as you type or drag.
10 – 500
1 lb = 0.453 kg
50 – 300
1 inch = 2.54 cm
Quick insights
Healthy weight min
57
Healthy weight max
76
Quick answer
What is a healthy BMI?
BMI 18.5–24.9 is considered healthy. Under 18.5 is underweight; 25–29.9 is overweight; 30+ is obese. BMI is a screening tool, not a diagnosis.
How it works
From inputs to result in four steps
A quick walkthrough of what this calculator does behind the scenes.
- 1
Enter your height in cm (or convert: 1 inch = 2.54 cm).
- 2
Enter your weight in kg (or convert: 1 lb = 0.453 kg).
- 3
See your BMI and health category.
Formula
The math behind the number
No black box — here's exactly how the result is computed.
Formula
BMI = weight_kg ÷ (height_m)²
For imperial:
BMI = 703 × weight_lbs ÷ height_inches²Examples
Real-world scenarios
See how the numbers play out for typical use cases.
Scenario 2
Imperial example
154 lbs, 5'9" (69 inches) → BMI = 703 × 154 ÷ 69² = 22.7 — Normal weight.
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